ci: use user-writable Rust paths on self-hosted runners

.github/actions/rust-paths/action.yml

@@ -0,0 +1,29 @@
+# Copyright 2024 RustFS Team
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: "Configure Rust Paths"
+description: "Use user-writable Rust paths on self-hosted lab runners"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Configure user-writable Rust paths
+      if: runner.environment == 'self-hosted'
+      shell: bash
+      run: |
+        set -euo pipefail
+        mkdir -p "$HOME/.rustup" "$HOME/.cargo/bin"
+        echo "RUSTUP_HOME=$HOME/.rustup" >> "$GITHUB_ENV"
+        echo "CARGO_HOME=$HOME/.cargo" >> "$GITHUB_ENV"
+        echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"

.github/actions/setup/action.yml

@@ -71,6 +71,10 @@ runs:
       with:
         version: "25.12.19"
 
+    # Lab runners ship root-owned /usr/local/{rustup,cargo}; rustup cannot update toolchains there.
+    - name: Configure user-writable Rust paths
+      uses: ./.github/actions/rust-paths
+
     - name: Install Rust toolchain
       uses: dtolnay/rust-toolchain@stable
       with:

.github/workflows/ci.yml

@@ -98,6 +98,7 @@ jobs:
     runs-on: [self-hosted, lab-small]
     steps:
       - uses: actions/checkout@v6
+      - uses: ./.github/actions/rust-paths
       - uses: dtolnay/rust-toolchain@stable
       - name: Typos check with custom config file
         uses: crate-ci/typos@master
@@ -196,6 +197,9 @@ jobs:
       - name: Make binary executable
         run: chmod +x ./target/debug/rustfs
 
+      - name: Configure user-writable Rust paths
+        uses: ./.github/actions/rust-paths
+
       - name: Setup Rust toolchain for s3s-e2e installation
         uses: dtolnay/rust-toolchain@stable